How to increase Jar heap space in Linux

Hi everyone ,

After creating my executable jar program, i used Launch4J to convert it to exe file + to increase the reserved Heap space for the program in windows O.S.

Now in Linux and other operating systems i use only the executable jar file and i can't find a way to increase the reserved Heap space for my program, so i'll get "Out of memory" error.

Is their a way to overcome this like the solution mentioned for windows O.S ?

Thanks ,
Hesham

Have a look through the java tool documentation, particularly the -Xmx and -Xms options, which allow you to alter the possible heap memory use. That might help. It should work the same on any operating system.

You can either write a shell scrip to launch the JVM with increased heap size or use webstart.

EDIT:

Apparently launch4j that you used for WinOS also works on Linux and Solaris also. Check out http://launch4j.sourceforge.net

Apparently launch4j that you used for WinOS also works on Linux and Solaris also.

As i understood ... "launch4j" has a Linux,mac & Solaris versions but it is going to create an (*.exe) file too in these operating systems.
I think there'll be no other way than to create a script file for every O.S.

particularly the -Xmx and -Xms options, which allow you to alter the possible heap memory use

I think that's what Launch4J does in windows O.S. I didn't read about it but i think they create a batch file inside the (exe) sending the memory parameters you mentioned through it to the JVM. But how to do that for other operating systems except in a script file for each O.S ?

I thought of creating a small jar file defining those parameters in it + call my program jar file .... But that would be very bad

What do you think ?

Starting two JVMs could significantly increase startup time and memory requirements. I think shell script is not such a bad idea especially taking into consideration how common scripts are in Linux world. There is another launcher called Jnix that is compatible to Launch4j but I have no experience of using it, it might be worth a try.

Thanks a lot Moojid for your help.
It's my first time to hear about Jnix ... I tried it and created the script so easily.
I am just waiting to install Linux O.S to try it out, but i'm sure it'll work fine.

So thanks again for the help.